Construction and verification of energy and mass transfer model for HIsmelt smelting reduction main reactor

PANG Jing; WANG Zhen-yang; ZHANG Jian-liang; ZHANG Shu-shi

doi:10.13228/j.boyuan.issn0449-749x.20220130

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Iron and Steel ›› 2022, Vol. 57 ›› Issue (9) : 57-64. DOI: 10.13228/j.boyuan.issn0449-749x.20220130

Raw Material and Ironmaking

Construction and verification of energy and mass transfer model for HIsmelt smelting reduction main reactor

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Abstract

HIsmelt smelting reduction ironmaking process takes iron ore powder and coal powder as raw materials, and does not require sintering, pelletizing and coking in the process. Compared with the blast furnace ironmaking process, it has the advantages of carbon reduction and emission reduction. Clearing the process of energy and mass transfer has guiding significance for the actual production of HIsmelt smelting reduction ironmaking. Based on the material balance and heat balance equation, the material and energy balance of input and output HIsmelt main reactor were calculated, and the energy and mass transfer model was established. The model was corrected by mass distribution ratio of each element between slag and iron calculated by Equilib module in FactSage and the actual production data. The model could calculate the effects of raw material and fuel composition, mass ratio of iron ore to coal, secondary combustion rate, hot air oxygen content and other parameters on the main smelting indexes such as slag iron temperature, slag composition, hot air volume and gas volume. Secondly, based on the model, the material balance and heat balance were calculated. According to actual production data, the calculation results of model were verified, and the results show that the model was highly consistent with the actual production data. The effect of the mass ratio of iron ore to coal on smelting was studied. When the mass ratio of iron ore to coal is between 1.39 and 1.45, a reduction of 0.1 in the mass ratio of iron ore to coal will reduce the secondary combustion rate by 0.23%, resulting in a lower utilization rate of gas chemical energy, while more hot air is needed to make the pulverized coal burn, and the amount of hot air and gas production increases, which can be improved by appropriately increasing the oxygen content of the hot air to improve the secondary combustion rate and reduce the amount of gas. The decrease of the mass ratio of iron ore to coal by 0.001 increases the slag iron temperature by 3.76 ℃, which is conducive to the subsequent processing of molten iron. However, the increase in hot metal temperature reduces the ratio of elemental Fe in the iron and slag, which increases the mass percent of FeO of slag by 0.026% and increases the iron loss, which can be reduced by reducing the amount of oxygen-rich hot air blowing to reduce the amount of iron oxidation, thus reducing the iron loss.

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energy and mass flow / HIsmelt / smelting reduction vessel / secondary combustion rate / mass ratio of iron ore to coal / iron content of slag

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PANG Jing, WANG Zhen-yang, ZHANG Jian-liang, et al. Construction and verification of energy and mass transfer model for HIsmelt smelting reduction main reactor[J]. Iron and Steel, 2022, 57(9): 57-64 https://doi.org/10.13228/j.boyuan.issn0449-749x.20220130

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